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Electron Transfer between Different Lanthanide Centers in BaF2 Crystals—Part II: Transfer Mechanisms

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Abstract

Processes of photo-induced electron transfer from a bivalent acceptor lanthanide (Eu, Sm, and Yb) onto a trivalent donor lanthanide (Nd, Sm, Dy, Tm, and Yb) and the inverse thermally activated transfer are studied in barium fluoride crystals. At room temperature, photoinduced electron transfer is accompanied by oncoming displacement of the interstitial charge-compensating fluoride ion. On photoquenching at low temperatures, a bivalent donor lanthanide remains next to the interstitial fluoride ion, which causes a redshift of its 4f–5d absorption bands. The shift increases as the lanthanide size decreases (as in the series Nd, Sm, Dy, Tm, and Yb). A detailed analysis of the mechanisms of photo and thermal electron transfers between the different lanthanide centers in BaF2 crystals is provided.

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Authors and Affiliations

  1. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia

    E. A. Radzhabov & V. A. Kozlovskii

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  1. E. A. Radzhabov
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  2. V. A. Kozlovskii
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Correspondence to E. A. Radzhabov.

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Translated by A. Kukharuk

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Radzhabov, E.A., Kozlovskii, V.A. Electron Transfer between Different Lanthanide Centers in BaF2 Crystals—Part II: Transfer Mechanisms. Phys. Solid State 61, 785–788 (2019). https://doi.org/10.1134/S1063783419050287

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  • DOI: https://doi.org/10.1134/S1063783419050287

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